Quote:
In a revolver round, you'd maybe have some leap forward rather than setback?
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Sorry, I should have been a little more clear.
I'm not terribly worried about bullets working loose in the cylinder, it's setback.... but not from recoil. These little 71gr 'things' are loose enough to slide into the case with the slightest touch. I managed to get 12 rounds put together, to see if I could trust a taper crimp. (Non-scientific, push on the bullet with my thumb, test.)
Two bullets held tight.
About 6 pushed in easily.
The rest pushed in easily, then actually fell to the powder charge.
Being HP-38, I didn't want to chance super high pressures, from the decreased volume.
That's why I'm debating about Trail Boss. I can use a powder charge that is not compressed, but does support the bullet; and still seat beyond the ogive, just enough to roll crimp it in - wadcutter style.
(Trail Boss has some nice warnings saying to
never compress it.)
As for the 71gr bullets, in general -
You may want to give Sierra a call. (800-223-8799) Their advertisements always claim they will give load data for "Any bullet. Any Powder. Any Cartridge."
The only data I have found is the JHP data from the
Shooting Times article:
71gr Magtech JHP, 9.7gr W540, CCI 500 primer. (1,400 fps - SP101. 1,774 fps - 7.5" Blackhawk.)
Everything else I have found was on internet forums, and varied so wildly that I chose to ignore it all.